Saturday, October 10 · typical odds for a Saturday (too early for a weather forecast) · issued Sun 8:00 PM ET · 3 nonstops

Sat, Oct 10: UA 1789 at 06:00 is the safest bet, 4% chance of being 15+ min late; the others run 11–14%.

Safest bet that day UA 1789 RDU 06:00 → IAD 07:11 · 4% chance 15+ min late · usually 96% on time Riskiest UA 557 RDU 15:00 → IAD 16:09 · 14% chance 15+ min late

Every nonstop on Sat, Oct 10

12-month record →

Ranked by the chance of arriving 15+ minutes late (typical odds: the weather this date has had in past years), with each flight’s on-time record over Aug 2025 – Jul 2026 beside it. Times are local. Pick a flight for its forecast. Click a column to sort.


UA 1789 United Flight history →	RDU 06:00	IAD 07:11	4%	2%	0.7%	96%
UA 2642 United Flight history →	RDU 19:43	IAD 20:58	11%	6%	0.6%	83%
UA 557 United	RDU 15:00	IAD 16:09	14%	5%	0.6%	no record

How these are worked out. Each flight’s odds are our forecast for that day (typical odds until the weather forecast covers it); flights of airlines we don’t forecast yet use their 12-month record and are marked. Makes the connection: the first flight’s 12-month lateness curve, scaled so its chance of arriving 15+ min late matches the day’s forecast, at the layover minus the 45-minute minimum (90 on separate tickets). Arrives on time: first flight not cancelled × connection made × second flight not cancelled × second flight within 15 minutes, each from the day’s forecast.

About this data: forecast odds from our model for Sat, Oct 10 (newest published update); 12-month records from US DOT on-time data, Aug 2025 – Jul 2026, all US airlines; regional flights count under the airline that sells them. JSON